Also upgrade tie rods to titanium, thats the only thing other than a shock top I have broke yet. The Jammin extended chassis is also a great upgrade. I have an OS .18TZ in my truck and it absolutely rips! But I have heard good things about the Jammin .12 and its cheap! I put a Losi 8ight clutch on mine as well, it fits and its super smooth! Good luck with the search but its kinda hard since you need a slide carb, rear exhaust, and an SG crank!